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WITNESSES:

C. F. HELFLINGER.

COAL DRILL.

APPLICATION FILED NOV-7.1911.

Patented July 29, 1919.

M M VE/V TOR A TTORNE Y 'ms COLUMBIA PLANDCIRAPH 410-, WASHINGTON, D. c.

human STATES PATENT orrron.

CHARLES. FL'I-IELFLINGER, OF DURHAM, WASHINGTON.

CQAL-DRILL.

Specification of Letters Patent. Patgnted Juiy'29, 1919.

' Application filed'November 7, 1917. Serial No. 200,669.

To all whom it may concern:

Be it known that 1, CHARLES F. HELFLIN- GER, a citizen of the United States, residing at Durham, in the county ofKing and State of lVashington, have invented certain new and useful Improvements in Coal-Drills, of which the following is a specification.

My invention relates to improvements in coal drills. F

In the drawings, Figure 1 is a side elevation ofmy device. Fig. 2 is a front elevation of same. Fig. 3 is an enlarged plan of applicants drill supporting carriage, with parts broken away. Fig. 4 is a detail view partly in section of the end of the drill screw and the bit. Fig. 5 is a detail section on the line 5-5 of Fig. 3.

Referring more particularly to the drawings, numerals 1 and 2 indicate parallel side plates which are joined together at either end by means of tapered end blocks 8. The side plates and end blocks constitute the major portions of the drill supporting box. Side plates 1 and 2 areeach provided with a row of holes 4 for the purpose of securing a drill carriage, as will be set forth later. The upper block 3 is provided with a pointed spud 5, is slidably mounted in the block and has ratchet teeth 6 on one side. A spring dog 7 is secured to block 3 and normally engages ratchet teeth 6 so as to nor mally maintain the spud 5 in an extended position. Lower block 3 is provided with a threaded spud 8 which cooperates with similar threads in the block and is extended against the floor of the shaft by means of a handle 9. In operation, the above described device is set solidly intermediate the sides of roof and floor of the coal shaft, and may be rotated about the spuds as an axis. A can riage which consists of a pair of similar arms 10, is slidably mounted upon the drill supporting bar with one of the arms 10 engaging each side of plate 1. Hooked ends 10 engage the front edge of the side plates 1 and lugs 10" engage the back edges of the said side plates. It will be understood that the carriage stands at a slight angle with respect to the plate 1, therebybeing somewhat self-locking with respect to the plates. Spring bolts 11 are mounted on each arm 10 and normally engage the holes 4 in side plates 1, thereby locking the carriage against accidental movement. The bolts 11 are held in place by the inherent spring of the supporting member and are easily witharms, 10 are provided 1 with bearings 12 which support drill carriage trunnions 13, which in turn,uarefintegral with an internally threaded'drill box 14. Drill box 14 is halved. and the upper half. is hinged at 15, to the lower half. Av beveled cam-lock 16 nor- 'mally holdsthe twoha'lves of the drillbox together, thus forming a continuously threaded box, within which is mounted a similarly threaded drill screw 17 Arms 10 are prevented from any lateral spreading by means of collars 18 on the outer ends of trunnions 13. Drill screw 17 is shanked and squared as at 19 adjacent either end. The forward or bit end of the screw is tapered as at 20, to cooperate with a similarly tapered socket 2 on the end of a bit 22. Members 20 and 21 are cooperatingly tapered and cooperatingly threaded. There are sufficient threads 23 externally upon the tapered portion 20 and internally on the socket 21 to permit of the bit being rotated a portion of a revolution in order to bring it up tight and'snug against the drill screw. The socket 21 is notched as at 24 so that a bit which is not attached to the drill screw, may be used as a wrench to cooperate with the shank portion 19 and act as a wrench. The device is arranged as shown in Figs. 1 and 2 with the drill screw passing through the drill box 14 and a bit secured to the end of the drill screw. A crank is used upon the other end of the drill screw to rotate the screw and bit, thereby drilling the face of the coal heading. When the hole has been drilled to the full extent of the connected screw, the drill box is opened and the screw and bit withdrawn without releasing the bit from the screw, thereby removing the chips from the drilled hole in the coal. The column and carriage are then rotated through an angle of 180 degrees and the screw replaced in the drill box, after which the drill is again advanced to the limit of the length of the screw. It will be understood that by rotating the supporting columns, that the drill box is brought closer to the face of the coal, thereby permitting the drill to be sunk deeper into the coal without resetting the column. It will be understood that the carriage will be adjusted vertically with respect to the column by sliding the arm 10 up or down the column as desired.

While I have shown a particular form of embodiment of my invention, I am aware drawn from the'holes4.n The outer ends of ily suggest themselvesto others skilled in.

the art Without departing from the spirit and scope of the invention, and I therefore desire to avoidwbeing limited to the exact form shown and described.

Having described my invention, 'What I claim as new and Patent, is

In a- 'coaldrill, the; combination of a pair of parallel bars formed along-their edges with alinie'd perforations, a block at the ends of the para-Mei bars and connected thereto, the blocks; haying 'ali n'ed openings,"pointed pins extending through the alined openings,

Copies; 0t this pitentmey he'obtaiimdz for live; Ieents eaolr, by aflfimssin-gthe v v Washington, D. O.

desire to protect byLetters' means for adjusting the pins, a pair of parallel side frames extending across the outer surfaces of the side bars, each side frame having a hook at its front end to engage the front edges of the bars, inwardly extending lugs on the side frames to engage the rear edges o'f'the bars, resiliently supported studs extending inwardly from the frame and engaging the alined perforations in the bars, a rod connecting the-rear ends of the side frames, F and a drill'mount supported on the rod- In testimony whereof I afiiX my signature iOHARLES. HELFLINGER.

Commi s ner of k t nit 

